JPS623045A - Product of ultraviolet light intercepting glass - Google Patents

Abstract

PURPOSE:To reduce the cost and improve adhesion to glass and discoloration of films in a high-temperature atmosphere, by coating a formed glass article at a high temperature just after forming with a coating material containing an organometallic compound. CONSTITUTION:A formed glass article at a high temperature just after forming is coated with a coating material containing an organometallic compound at least once to produce the aimed ultraviolet light intercepting glass product. The formed glass article just after forming has preferably 300-700 deg.C body glass temperature. Normally, the body glass temperature of the formed glass article just after forming is <=700 deg.C, and rapidly decreased by allowing the article to stand. If the body glass temperature becomes <300 deg.C, the cracking of the body glass results. Ce, Fe, Ti and V are preferred for the metal in the above-mentioned organometallic compound. The reason why the organometallic compound is used is that the film of a metal oxide having good adhesion can be readily formed when applied to the formed glass article at a high temperature.

Description

[Detailed Description of the Invention] [Technical Field] His invention involves creating a metal oxide film on the glass surface.
This invention relates to a method for manufacturing ultraviolet-ray-blocking glass products that block ultraviolet rays.

[Background technology]

Generally, UV-cut glass and organic paints containing UV absorbers are used to block UV rays.
Each of them has the following problems: (1) When using ultraviolet-cut composition glass Ultraviolet-cut composition glass is prepared by adding CeO2, FeO, TiO2, etc. to a normal glass composition. However, when creating this glass, it is necessary to change the composition of the glass, which requires a lot of effort and increases costs.

■ When using an organic paint with added ultraviolet absorber An organic paint with added ultraviolet absorber is a paint made by adding an ultraviolet absorber to an organic resin paint. However, this paint does not have very good adhesion to glass, and there is a possibility that the paint film will peel off or smudge.

Additionally, the paint film will change color if used in a high temperature atmosphere.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing ultraviolet ray-blocking glass products that does not cause the above-mentioned problems.

[Disclosure of the invention]

In order to achieve the above object, the gist of the present invention is a method for producing an ultraviolet-blocking glass product, in which at least one layer of paint containing an organic metal compound is applied to a high-temperature glass molded product immediately after molding.

That is, in this invention, (a) the glass molded product is simply coated with paint immediately after molding, so there is no need to change the composition of the glass fabric, the alcohol is cheap, and the slow cooling of the glass globe is This can be done at the same time as the baking process, and since the paint contains an organic metal compound, the quality of the paint film (adhesion, color fastness) is good.

Next, this will be explained in detail.

Immediately after molding, the glass molded product has a raw glass temperature of 300~300°C.
Preferably the temperature is 700°C. Normally, the temperature of the raw glass of a glass molded product immediately after molding is 700° C. or lower, and the temperature drops rapidly when left standing. However, if the temperature of the raw glass becomes less than 300°C, the raw glass may break.

Immediately after molding, this high-temperature glass molded product is painted.

As a result, the applied coating film is baked using the heat of the high-temperature glass molded product, thereby improving thermal efficiency. However, even if the temperature or amount of heat of the glass molded product is low and it is not possible to bake it sufficiently with that alone and heating is required, there is no difference in that the waste heat of the glass molded product is effectively used. falling within the scope of this invention.

The paint applied to the above-mentioned glass molded product contains an organic metal compound. The metal of the organometallic compound is C
Preferably, they are e, Fe, 'ri and ■. The reason for using the organometallic compound here is that it can easily form a metal oxide film with good adhesion when applied to a high-temperature glass molded product. Furthermore, the reason why the metals of the organometallic compound are Ce, Fe, Ti, and (2) is that these metals absorb ultraviolet rays better than other metals. Furthermore, the same effect can be obtained even when these organometallic compounds are used in the form of a mixture.

In addition, by applying at least one layer of these metal oxide films or mixed metal oxide films, the UV-cutting effect is exhibited, and the effect becomes more pronounced by increasing the number of layers or film thickness. . However, if the film thickness is too thick, the adhesion will deteriorate, so 1) 'iJ film thickness is 3
000 Å or less, and it is preferable to increase the number of layers in order to improve the UV-cutting effect.

Paints are made by dissolving an organometallic compound in a suitable organic solvent and adding water, acid, etc., if necessary.

The coating method is not limited in any way, but since the object to be coated is at a high temperature, spraying is appropriate.

If the organic solvent is flammable, to prevent the solvent from catching fire,
It is desirable that the coating be performed in a nitrogen atmosphere.

In addition, since the glass molded product is painted immediately after forming, that is, before it is placed in the slow cooling furnace, and then placed in the slow cooling furnace, the baking of the paint and the slow cooling of the glass molded product can be done at the same time, which further streamlines the process. , an example will be described.

Immediately after molding, a glass molded product at high temperature (300 to 700°C) was coated under the conditions listed in Table 1. The coating was applied under the conditions listed in Table 1 to obtain the ultraviolet blocking effect as listed in Table 1. The blank is an unpainted glass molded article.

The method for measuring physical properties (ultraviolet blocking effect) is as follows.

The transmittance of the sample after baking the ultraviolet cut coating was measured using a spectrophotometer from 300 to 800 degrees. Find point A from the chart as shown in Figure 1,
The wavelength at point A was taken as a representative value of the ultraviolet blocking effect. In the example shown in the figure, the ultraviolet blocking effect is 420 (nm).

〔Effect of the invention〕

As described above, the manufacturing method of the ultraviolet ray cut glass product according to the present invention makes it possible to obtain a glass product with a high-quality coating film, and is also excellent in reducing the cost of raw materials for paint and effectively utilizing heat. .

[Brief explanation of the drawing]

Figure 1 is a graph for viewing the ultraviolet blocking effect. Agent: Patent Attorney Takehiko Matsumoto Figure 1 Wavelength (nm)

Claims (4)

[Claims] (1) A method for producing ultraviolet ray-blocking glass products, in which at least one layer of paint containing an organic metal compound is applied to a high-temperature glass molded product immediately after molding. (2) The method for producing an ultraviolet-cut glass product according to claim 1, wherein the baking process utilizes the heat of a high-temperature glass molded product immediately after molding. (3) The temperature of the high-temperature glass molded product immediately after molding is 300~
A method for producing an ultraviolet-cut glass product according to claim 1 or 2, wherein the temperature is 700°C. (4) The method for producing an ultraviolet-cut glass product according to any one of claims 1 to 3, wherein the metal of the organometallic compound is at least one selected from Ce, Fe, Ti, and V.